Programmable controller with an operator messaging function

Details Programmable controller with an operator messaging function Programmable controller with an operator messaging function

1991-08-13

1994-06-07

Heckler, Thomas M.

Boots, shoes, and leggings

364DIG2, 3649269, 364949, 3649275, G06F 1546

Patent

active

053197836

ABSTRACT:
A programmable controller senses the status of input devices and controls the state of operating devices in accordance with a stored ladder logic control program. A memory of the programmable controller contains message data and data defining a set of expected transitions of the status of selected input devices. An instruction of the ladder logic initiates execution of a machine language message program which causes the programmable control to inspect the states of the selected input devices to determine whether an expected transition has taken place. When one of the expected transitions occurs, the message data and an identification of the selected input device are sent to a personal computer connected to the programmable controller. The personal computer uses the the data from the programmable controller to formulate an alphanumeric message which is presented to the operator on a display device.

REFERENCES:
patent: 3974484 (1976-08-01), Struger et al.
patent: 4302820 (1981-11-01), Struger et al.
patent: 4442504 (1984-04-01), Dummermuth et al.
patent: 4742443 (1988-05-01), Rohn et al.
patent: 4858101 (1989-08-01), Stewart et al.
patent: 4858102 (1989-08-01), Lovrenich
patent: 4876664 (1989-10-01), Bittorf et al.
patent: 4937777 (1990-06-01), Flood et al.
Book entitled Zone Logic by Ralph Roberts, 1989 Aug. 1987 issue of Control Engineering Magazine article entitled "Distributed Machine Control Uses Zoned Logic, Isolated Controllers, Fiber Optics".
Master's thesis from the Massachusetts Institute of Technology entitled "A CRT-Based State Transition Language for Industrial Sequential Control" dated Jun. 1981.

Affiliated with

Also associated with

Rating

Programmable controller with an operator messaging function does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable controller with an operator messaging function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable controller with an operator messaging function will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-801034